java写出下面程序的运行结果。

写出下面程序的运行结果。

public class TestOne {

public static void main(String[] args) {

    int a = 10;

    int b = 20;

    int c = a + b;

    System.out.println("a + b = " + c); //a + b = 30

    System.out.println(a + " + " + b + " = " + a + b);

    System.out.println(a + " + " + b + " = " + (a + b));

    String name = "jack";

    System.out.println("登录成功，欢迎" + name + "回来！");

}

}

a + b = 30
10 + 20 = 1020
10 + 20 = 30
登录成功，欢迎jack回来！

运行结果如下